Device to prevent breakage of poles and wires



Dec. 26, 1950 v. c. DAVIS 2,535,270

DEVICE TO PREVENT BREAKAGE 0F POLES AND WIRES Original Filgd June 10, 1951 Patented Dec. 26, 1950 UNITED STATES? PATENT OFFICE DEVI-CE- TO PREVENT- BREAKA'GE' OF P'OLES AND WIRES Vernon :Carroll Davis, Holabird,-S. Dala. Substituted for abandoned application semina- 5433175, June 10;-1931. This:applicationilvlarch'l 551948, SerialNo. 13,118

4'.Claims..l. (Cl. 17'4"158) My invention relates to the arts oftelegraphy, telephony, and electrical power transmission, and it particularly has referenceto the stringing of line or circuit wires on poles.

The generalipractice.atipresenti is to provide poles .with cross armscarrying insulator pins, on

which the insulators are screwed... The line wires are anchored or tied to these insulators and strung from pole -to pole:

In storms, especially seet-and ice storms, and storms ot r high wind velocity-. the: wires getvmechanically, overloaded and.frequently break; or the poles are broken off with much damage.

My invention'therefore has'for' an object to provide ainreans of mountingz'th'eiline wires onthe poles irrsuchi-a waythaton the line vwires becoming mechanicall loaded beyond a predetermined weight or degree, the insulator with the line wire attached will become automatically released from the pole so that the insulator and line wire will be free to fall to the ground without breaking either the pole or the line wire.

Generically, the invention resides in providing an insulator carrying arm, to the insulator of which the line wire is anchored as usual and which arm'is releasably mounted in a suitable block which is securely fastened n the cross arm of the pole; the arrangement is such that upon excess weight or strain being put on the line wire it will cause the arm to release itself from the block and fall free of the same.

Other objects will in part be obvious and in part be pointed out hereinafter.

To the attainment of the aforesaid objects and ends, the invention still further resides in the novel details of construction, combination and arrangement of parts, all of which will be first fully described in the following detailed description, then be particularly pointed out in the ap pended claims, reference being had to the accompanying drawing, in which:

Figure 1 is an elevation of the top part of a pole equipped with my invention.

Figure 2 is an enlarged vertical section of one of the wire supporting units, the parts being in the normal position in full lines and in an abnormal position in dotted lines.

In the drawing, in which like numerals of refer ence indicate like parts in all the figures, l represents the pole whose cross arms 2 are braced at 3 in the usual manner.

4 is a mounting block which has a shank 5 bolted at 6 to the cross arm and which is provided with a chamber I entering from the bottom.

8 is a transverse threaded bore intersecting the chamber l and inwwhichis located alatch l I.. v screw plug 9 vand spring. If], the latch .havingei shank i2 to receive the spring.

' l3:is another transversely threaded-bore intersecting the chamber 1. This-polecarriesuapresser pisto i5, pressed byaspring. l4a into. which .theshank. it of the presser piston .l5 p ro jects- The compression of the spring l4 =is'.regu.- lated by a suitable adjusting screw plugl'h The insuiator arm 28 has a threaded pinportion- 2i for the insulator 2'2lto which thelinawireu Eli-is secured in the usual way. The armmz ophas a. shank it that projects upsinto the-chamber. II and has a bevelled heel l e-toengagethealatch ll l on which :ithangs. The shank lsealso engagesr. at: 23,- the block i as the fulcrum of. allever, so..- thatwhen eXcesswe-ight isapplied to theinsulator: carrying end of the arm it will be caused to rock on the fulcrum 23, thereby disengaging the end it from thelatch II and dropping out of the chamber l. The tendency of the arm 20 to rock on the fulcrum 23 is resisted by the presser piston E5, the degree of resistance being adjustable by virtue of the screw plug l1. 'By moving the plug in or out the compression may be increased or diminished as desired. Having once set the tension of the spring [4 it will take a predetermined weight on the insulator end of the arm 20 to force the piston back and enable the end IQ of the shank 8 to clear the latch ll so that the insulator carrying arm 2!! can fall out of the block 4.

In restoring the parts to their assembled position it is only necessary to push I8 up into the chamber ll where it will force in the latch ll until [9 has cleared it when the latch I! wi l be projected under the end It to hold it as before.

This application is a substitute for application Serial No. 543,475, filed June 10, 1931. now abandoned.

From the foregoing description, taken'in connection with the accompanying drawing, it is thought the complete construction, operation, and advantages of my invention will be clear to those skilled in the art.

What I claim is:

1. In a device of the character described, a fixed block to be mounted on the cross arm of a pole, an insulator carrying lever arm, and means releasably mounting said arm in said block for rel-ease upon overloading the insulator carrying part of the arm, said block having a socket into which one end of said arm projects, the other end of the arm carrying the insulator, yieldable means engaging that end of said arm which is within the socket to hold the same therein, said arm pivotally engaging a portion of said block to function as a lever to rock the end of said lever away from said yieldable means when the insulator carrying end thereof is mechanically overloaded to release the lever from the holding means.

2. In a device of the character described, a fixed block to be mounted on the cross arm of a pole, an insulator carrying lever arm, and means detachably mounting said arm in said block for release upon overloading the insulator carrying part of the arm, said block having a socket into which one end of said arm projects, the other end of the arm carrying the insulator, means engaging that end of said arm which is within the socket to hold the same therein, said arm functioning as a lever to rock when the insulator carrying end thereof is mechanically overloaded to release itself from the holding means, and adjustable resistance means engaging said arm and tending to prevent its release below a predetermined load.

3. In a device of the character described, a fixed block to be mounted on the cross arm of a pole, an insulator carrying lever arm, and means detachably mounting said arm in said block for release upon overloading the insulator carrying part of the arm, said block having a socket into which one end of said arm projects, the other end of the arm carrying the insulator, means engaging that end of said arm which is within the socket to hold the same therein, said arm functioning as a lever to rock when the insulator carrying end thereof is mechanically overloaded to release itself from the holding means, and adjustable resistance means engaging said arm and tending to prevent its release below a predetermined load, said adjustable resistance means comprising a presser piston, a piston pressing spring and means for adjusting the tension of said spring.

4. In a device of the character described, a fixed block to be mounted on the cross arm of a pole, an insulator carrying lever arm, and means detachably mounting said arm in said block for release upon overloading the insulator carrying part of the arm, said block having a socket into which one end of said arm proects, the other end of the arm carrying the insulator, a latch yieldably engaging that end of said arm which is within the socket to hold the same therein, said arm functioning as a lever to rock when the insulator carrying end thereof is mechanically overloaded to release itself from the holding means, and resistance means engaging said arm and tending to prevent its release below a predetermined load.

VERNON CARROLL DAVIS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 816,981 Iliohan Apr. 3, 1906 2,107,594 Bicknese Feb. 8, 1938 FOREIGN PATENTS Number Country Date 26,099 Great Britain Nov. 10, 1910 

